Thanks Pete - I have 2 instances of SimConnect.XML the only one that could potentially be the one involved with the issue is in the FSX SDK (the other is for an add-on that I've installed prior to experiencing the problem) however I've renamed both files and the problem still occurs. Do you know of any issues with the SDK?
I understand from what you say that FSUIPC is not the problem, but it's presence is facilitating this TCP traffic somehow. I've tested repeatedly and the only time FSX generates this level of constant internet activity is when the FSUIPC files are is in the modules section, strangely the TCP port in use seems to be different every time ?!?
I have only just unistalled FSX Standard and all my add-ons and replaced it with a FSX Deluxe, it could be that the uninstall left some anamolies in which case the only way forward is Format c:\. :cry:
BTW I would like to take this opportunity to thank you for all the hard work you've put into FSUIPC over the years, it's easy to take this for granted, but simming would certainly be poorer if it wern't for your efforts, thanks.